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Contents
# encoding: utf-8
require "logstash/instrument/metric"
module LogStash module Instrument
# This class is used in the context when we disable the metric collection
# for specific plugin to replace the `NamespacedMetric` class with this one
# which doesn't produce any metric to the collector.
class NullMetric
attr_reader :namespace_name, :collector
def initialize(collector = nil)
@collector = collector
end
def increment(namespace, key, value = 1)
Metric.validate_key!(key)
end
def decrement(namespace, key, value = 1)
Metric.validate_key!(key)
end
def gauge(namespace, key, value)
Metric.validate_key!(key)
end
def report_time(namespace, key, duration)
Metric.validate_key!(key)
end
# We have to manually redefine this method since it can return an
# object this object also has to be implemented as a NullObject
def time(namespace, key)
Metric.validate_key!(key)
if block_given?
yield
else
NullTimedExecution
end
end
def counter(_)
NullGauge
end
def namespace(name)
raise MetricNoNamespaceProvided if name.nil? || name.empty?
NamespacedNullMetric.new(self, name)
end
def self.validate_key!(key)
raise MetricNoKeyProvided if key.nil? || key.empty?
end
private
class NullGauge
def self.increment(_)
end
end
# Null implementation of the internal timer class
#
# @see LogStash::Instrument::TimedExecution`
class NullTimedExecution
def self.stop
0
end
end
end
end; end
Version data entries
67 entries across 67 versions & 5 rubygems